The United States and Japan will step up their defence cooperation to deal with the threat from nuclear-armed North Korea as tensions in East Asia remain high, officials from the two allies said on Thursday.

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On Monday, the White House referred to "Columbia" in a statement about a call with Colombian President Juan Manuel Santos.

Aside from typos there is Trump's errant use of a hyphen in a Wednesday morning tweet in which he referred to "this Russian connection non-sense".

Just nitpicking? Does it really matter?

"It really goes to the heart of credibility," says Sue Burzynski Bullard, a board member at the American Copy Editors Society and a professor at the University of Nebraska-Lincoln. "If you can't get basic spelling and grammar right, people start to wonder what else you got wrong.

"They need to slow down and edit themselves, or hire some editors."

But Jacques Bailly, the University of Vermont professor who runs the Scripps National Spelling Bee, isn't too bothered.

"Spelling is not unimportant, but there are a lot more important things, like how you use the words and the content of them."

But he says spellcheck would help a lot.

The White House did not immediately respond to a request for comment.

While its spelling issues were far more limited, the Obama administration made mistakes. February came out as "Feburary" in 2015. And President Barack Obama memorably dropped an "E" in praising Aretha Franklin as the queen of soul in 2014 saying she "told us what R-S-P-E-C-T meant to her".